[PATCH v3 03/10] iw_cxgb4: Add module and low level device interface functions.

Steve Wise
2010-04-16T18:29:41Z

drivers/infiniband/hw/cxgb4/device.c | 520 ++++++++++++++++++++++++++++++++++
1 files changed, 520 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/hw/cxgb4/device.c

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
new file mode 100644
index 0000000..be23b5e
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -0,0 +1,520 @@
+/*
+ * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/debugfs.h>
+
+#include <rdma/ib_verbs.h>
+
+#include "iw_cxgb4.h"
+
+#define DRV_VERSION "0.1"
+
+MODULE_AUTHOR("Steve Wise");
+MODULE_DESCRIPTION("Chelsio T4 RDMA Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static LIST_HEAD(dev_list);
+static DEFINE_MUTEX(dev_mutex);
+
+static struct dentry *c4iw_debugfs_root;
+
+struct debugfs_qp_data {
+ struct c4iw_dev *devp;
+ char *buf;
+ int bufsize;
+ int pos;
+};
+
+static int count_qps(int id, void *p, void *data)
+{
+ struct c4iw_qp *qp = p;
+ int *countp = data;
+
+ if (id != qp->wq.sq.qid)
+ return 0;
+
+ *countp = *countp + 1;
+ return 0;
+}
+
+static int dump_qps(int id, void *p, void *data)
+{
+ struct c4iw_qp *qp = p;
+ struct debugfs_qp_data *qpd = data;
+ int space;
+ int cc;
+
+ if (id != qp->wq.sq.qid)
+ return 0;
+
+ space = qpd->bufsize - qpd->pos - 1;
+ if (space == 0)
+ return 1;
+
+ if (qp->ep)
+ cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u "
+ "ep tid %u state %u %pI4:%u->%pI4:%u\n",
+ qp->wq.sq.qid, (int)qp->attr.state,
+ qp->ep->hwtid, (int)qp->ep->com.state,
+ &qp->ep->com.local_addr.sin_addr.s_addr,
+ ntohs(qp->ep->com.local_addr.sin_port),
+ &qp->ep->com.remote_addr.sin_addr.s_addr,
+ ntohs(qp->ep->com.remote_addr.sin_port));
+ else
+ cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u\n",
+ qp->wq.sq.qid, (int)qp->attr.state);
+ if (cc < space)
+ qpd->pos += cc;
+ return 0;
+}
+
+static int qp_release(struct inode *inode, struct file *file)
+{
+ struct debugfs_qp_data *qpd = file->private_data;
+ if (!qpd) {
+ printk(KERN_INFO "%s null qpd?\n", __func__);
+ return 0;
+ }
+ kfree(qpd->buf);
+ kfree(qpd);
+ return 0;
+}
+
+static int qp_open(struct inode *inode, struct file *file)
+{
+ struct debugfs_qp_data *qpd;
+ int ret = 0;
+ int count = 1;
+
+ qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
+ if (!qpd) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ qpd->devp = inode->i_private;
+ qpd->pos = 0;
+
+ spin_lock_irq(&qpd->devp->lock);
+ idr_for_each(&qpd->devp->qpidr, count_qps, &count);
+ spin_unlock_irq(&qpd->devp->lock);
+
+ qpd->bufsize = count * 128;
+ qpd->buf = kmalloc(qpd->bufsize, GFP_KERNEL);
+ if (!qpd->buf) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+
+ spin_lock_irq(&qpd->devp->lock);
+ idr_for_each(&qpd->devp->qpidr, dump_qps, qpd);
+ spin_unlock_irq(&qpd->devp->lock);
+
+ qpd->buf[qpd->pos++] = 0;
+ file->private_data = qpd;
+ goto out;
+err1:
+ kfree(qpd);
+out:
+ return ret;
+}
+
+static ssize_t qp_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct debugfs_qp_data *qpd = file->private_data;
+ loff_t pos = *ppos;
+ loff_t avail = qpd->pos;
+
+ if (pos < 0)
+ return -EINVAL;
+ if (pos >= avail)
+ return 0;
+ if (count > avail - pos)
+ count = avail - pos;
+
+ while (count) {
+ size_t len = 0;
+
+ len = min((int)count, (int)qpd->pos - (int)pos);
+ if (copy_to_user(buf, qpd->buf + pos, len))
+ return -EFAULT;
+ if (len == 0)
+ return -EINVAL;
+
+ buf += len;
+ pos += len;
+ count -= len;
+ }
+ count = pos - *ppos;
+ *ppos = pos;
+ return count;
+}
+
+static const struct file_operations qp_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = qp_open,
+ .release = qp_release,
+ .read = qp_read,
+};
+
+static int setup_debugfs(struct c4iw_dev *devp)
+{
+ struct dentry *de;
+
+ if (!devp->debugfs_root)
+ return -1;
+
+ de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
+ (void *)devp, &qp_debugfs_fops);
+ if (de && de->d_inode)
+ de->d_inode->i_size = 4096;
+ return 0;
+}
+
+void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
+ struct c4iw_dev_ucontext *uctx)
+{
+ struct list_head *pos, *nxt;
+ struct c4iw_qid_list *entry;
+
+ mutex_lock(&uctx->lock);
+ list_for_each_safe(pos, nxt, &uctx->qpids) {
+ entry = list_entry(pos, struct c4iw_qid_list, entry);
+ list_del_init(&entry->entry);
+ if (!(entry->qid & rdev->qpmask))
+ c4iw_put_resource(&rdev->resource.qid_fifo, entry->qid,
+ &rdev->resource.qid_fifo_lock);
+ kfree(entry);
+ }
+
+ list_for_each_safe(pos, nxt, &uctx->qpids) {
+ entry = list_entry(pos, struct c4iw_qid_list, entry);
+ list_del_init(&entry->entry);
+ kfree(entry);
+ }
+ mutex_unlock(&uctx->lock);
+}
+
+void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
+ struct c4iw_dev_ucontext *uctx)
+{
+ INIT_LIST_HEAD(&uctx->qpids);
+ INIT_LIST_HEAD(&uctx->cqids);
+ mutex_init(&uctx->lock);
+}
+
+/* Caller takes care of locking if needed */
+static int c4iw_rdev_open(struct c4iw_rdev *rdev)
+{
+ int err;
+
+ c4iw_init_dev_ucontext(rdev, &rdev->uctx);
+
+ /*
+ * qpshift is the number of bits to shift the qpid left in order
+ * to get the correct address of the doorbell for that qp.
+ */
+ rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
+ rdev->qpmask = rdev->lldi.udb_density - 1;
+ rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
+ rdev->cqmask = rdev->lldi.ucq_density - 1;
+ PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
+ "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x\n",
+ __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
+ rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
+ rdev->lldi.vr->pbl.start,
+ rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
+ rdev->lldi.vr->rq.size);
+ PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
+ "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
+ (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
+ (void *)pci_resource_start(rdev->lldi.pdev, 2),
+ rdev->lldi.db_reg,
+ rdev->lldi.gts_reg,
+ rdev->qpshift, rdev->qpmask,
+ rdev->cqshift, rdev->cqmask);
+
+ if (c4iw_num_stags(rdev) == 0) {
+ err = -EINVAL;
+ goto err1;
+ }
+
+ err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
+ if (err) {
+ printk(KERN_ERR MOD "error %d initializing resources\n", err);
+ goto err1;
+ }
+ err = c4iw_pblpool_create(rdev);
+ if (err) {
+ printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
+ goto err2;
+ }
+ err = c4iw_rqtpool_create(rdev);
+ if (err) {
+ printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
+ goto err3;
+ }
+ return 0;
+err3:
+ c4iw_pblpool_destroy(rdev);
+err2:
+ c4iw_destroy_resource(&rdev->resource);
+err1:
+ return err;
+}
+
+static void c4iw_rdev_close(struct c4iw_rdev *rdev)
+{
+ c4iw_pblpool_destroy(rdev);
+ c4iw_rqtpool_destroy(rdev);
+ c4iw_destroy_resource(&rdev->resource);
+}
+
+static void c4iw_remove(struct c4iw_dev *dev)
+{
+ PDBG("%s c4iw_dev %p\n", __func__, dev);
+ cancel_delayed_work_sync(&dev->db_drop_task);
+ list_del(&dev->entry);
+ c4iw_unregister_device(dev);
+ c4iw_rdev_close(&dev->rdev);
+ idr_destroy(&dev->cqidr);
+ idr_destroy(&dev->qpidr);
+ idr_destroy(&dev->mmidr);
+ ib_dealloc_device(&dev->ibdev);
+}
+
+static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
+{
+ struct c4iw_dev *devp;
+ int ret;
+
+ devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
+ if (!devp) {
+ printk(KERN_ERR MOD "Cannot allocate ib device\n");
+ return NULL;
+ }
+ devp->rdev.lldi = *infop;
+
+ mutex_lock(&dev_mutex);
+
+ ret = c4iw_rdev_open(&devp->rdev);
+ if (ret) {
+ mutex_unlock(&dev_mutex);
+ printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
+ ib_dealloc_device(&devp->ibdev);
+ return NULL;
+ }
+
+ idr_init(&devp->cqidr);
+ idr_init(&devp->qpidr);
+ idr_init(&devp->mmidr);
+ spin_lock_init(&devp->lock);
+ list_add_tail(&devp->entry, &dev_list);
+ mutex_unlock(&dev_mutex);
+
+ if (c4iw_register_device(devp)) {
+ printk(KERN_ERR MOD "Unable to register device\n");
+ mutex_lock(&dev_mutex);
+ c4iw_remove(devp);
+ mutex_unlock(&dev_mutex);
+ }
+ if (c4iw_debugfs_root) {
+ devp->debugfs_root = debugfs_create_dir(
+ pci_name(devp->rdev.lldi.pdev),
+ c4iw_debugfs_root);
+ setup_debugfs(devp);
+ }
+ return devp;
+}
+
+static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
+{
+ struct c4iw_dev *dev;
+ static int vers_printed;
+ int i;
+
+ if (!vers_printed++)
+ printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n",
+ DRV_VERSION);
+
+ dev = c4iw_alloc(infop);
+ if (!dev)
+ goto out;
+
+ PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
+ __func__, pci_name(dev->rdev.lldi.pdev),
+ dev->rdev.lldi.nchan, dev->rdev.lldi.nrxq,
+ dev->rdev.lldi.ntxq, dev->rdev.lldi.nports);
+
+ for (i = 0; i < dev->rdev.lldi.nrxq; i++)
+ PDBG("rxqid[%u] %u\n", i, dev->rdev.lldi.rxq_ids[i]);
+
+ printk(KERN_INFO MOD "Initialized device %s\n",
+ pci_name(dev->rdev.lldi.pdev));
+out:
+ return dev;
+}
+
+static struct sk_buff *t4_pktgl_to_skb(const struct pkt_gl *gl,
+ unsigned int skb_len,
+ unsigned int pull_len)
+{
+ struct sk_buff *skb;
+ struct skb_shared_info *ssi;
+
+ if (gl->tot_len <= 512) {
+ skb = alloc_skb(gl->tot_len, GFP_ATOMIC);
+ if (unlikely(!skb))
+ goto out;
+ __skb_put(skb, gl->tot_len);
+ skb_copy_to_linear_data(skb, gl->va, gl->tot_len);
+ } else {
+ skb = alloc_skb(skb_len, GFP_ATOMIC);
+ if (unlikely(!skb))
+ goto out;
+ __skb_put(skb, pull_len);
+ skb_copy_to_linear_data(skb, gl->va, pull_len);
+
+ ssi = skb_shinfo(skb);
+ ssi->frags[0].page = gl->frags[0].page;
+ ssi->frags[0].page_offset = gl->frags[0].page_offset + pull_len;
+ ssi->frags[0].size = gl->frags[0].size - pull_len;
+ if (gl->nfrags > 1)
+ memcpy(&ssi->frags[1], &gl->frags[1],
+ (gl->nfrags - 1) * sizeof(skb_frag_t));
+ ssi->nr_frags = gl->nfrags;
+
+ skb->len = gl->tot_len;
+ skb->data_len = skb->len - pull_len;
+ skb->truesize += skb->data_len;
+
+ /* Get a reference for the last page, we don't own it */
+ get_page(gl->frags[gl->nfrags - 1].page);
+ }
+out:
+ return skb;
+}
+
+static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
+ const struct pkt_gl *gl)
+{
+ struct c4iw_dev *dev = handle;
+ struct sk_buff *skb;
+ const struct cpl_act_establish *rpl;
+ unsigned int opcode;
+
+ if (gl == NULL) {
+ /* omit RSS and rsp_ctrl at end of descriptor */
+ unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
+
+ skb = alloc_skb(256, GFP_ATOMIC);
+ if (!skb)
+ goto nomem;
+ __skb_put(skb, len);
+ skb_copy_to_linear_data(skb, &rsp[1], len);
+ } else if (gl == CXGB4_MSG_AN) {
+ const struct rsp_ctrl *rc = (void *)rsp;
+
+ u32 qid = be32_to_cpu(rc->pldbuflen_qid);
+ c4iw_ev_handler(dev, qid);
+ return 0;
+ } else {
+ skb = t4_pktgl_to_skb(gl, 128, 128);
+ if (unlikely(!skb))
+ goto nomem;
+ }
+
+ rpl = cplhdr(skb);
+ opcode = rpl->ot.opcode;
+
+ if (c4iw_handlers[opcode])
+ c4iw_handlers[opcode](dev, skb);
+ else
+ printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__,
+ opcode);
+
+ return 0;
+nomem:
+ return -1;
+}
+
+static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
+{
+ PDBG("%s new_state %u\n", __func__, new_state);
+ return 0;
+}
+
+static struct cxgb4_uld_info c4iw_uld_info = {
+ .name = DRV_NAME,
+ .add = c4iw_uld_add,
+ .rx_handler = c4iw_uld_rx_handler,
+ .state_change = c4iw_uld_state_change,
+};
+
+static int __init c4iw_init_module(void)
+{
+ int err;
+
+ err = c4iw_cm_init();
+ if (err)
+ return err;
+
+ c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
+ if (!c4iw_debugfs_root)
+ printk(KERN_WARNING MOD
+ "could not create debugfs entry, continuing\n");
+
+ cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
+
+ return 0;
+}
+
+static void __exit c4iw_exit_module(void)
+{
+ struct c4iw_dev *dev, *tmp;
+
+ cxgb4_unregister_uld(CXGB4_ULD_RDMA);
+
+ mutex_lock(&dev_mutex);
+ list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
+ c4iw_remove(dev);
+ }
+ mutex_unlock(&dev_mutex);
+
+ c4iw_cm_term();
+ debugfs_remove_recursive(c4iw_debugfs_root);
+}
+
+module_init(c4iw_init_module);
+module_exit(c4iw_exit_module);